little



E. C. 8v E. D. LITTLE.

GRINDING MILL,

Nan-113,179. Patented Manes, 1871.

. wlb s.

EDWIN D. LITTLE AND EDGAR O, LITTLE, OF SI-IABBONAS GROVE,

ILLINOIS.

Letters Patent No. 113,179, dated March 28, 1871.

IMPROVEMENT IN GRINDING-MILLS- To all whom it may concern Be it known that we, EDWIN DrLITTLE and ED- GAR O. LITTLE, of- Shabbonas Grovefin, the county of De Kalb and State of Illinois, have invented certain Improvements in Grinding-llI-aehines; and we declare the following to be a full, clear, and exact description thereof, reference being bad to the accompanying drawing, in which Figure l is a front elevation;

Figure 2, a vertical section in line am: of fig. 1; and

Figure 3, a side view of the concave and cylinder, detached.

Figure; is a transverse section of the cylinder M, showing the teeth on an enlarged scale.

Similar letters of reference indicate like parts.

This inveption relates to the class of metallic grinding-mills, and consists in an improved construct-ion of the several operative parts of the mill for the purpose of rendering its action more effective, and of enabling said parts to be more perfectly adjusted to each other than heretofore.

In the drawing-- A A represent the base, consisting of two parallel fi'ame pieces, and

B B are posts attached thereto, supported by braces l) b, and connected 'by cross-timbers G D, the latter very strong, and let into the sides of the posts so as to receive a firm support therefrom. t.

On the front side of the machine is a receptacle, E, which rests upon the base -timbers A A, and is supported laterally by the posts B B and braces 11 b, for the purpose of receiving the material that has been ground in the mill.

F is a shaft, running in boxes a a, attached to the.

front side of the posts B B, and provided with one or niorefly whecls f j, and with a belt-pulley, 11, by which the shaft is driven.

M is a metallic grinding-cylinder, keyed to the shaftF, and corrugated on its convex surface by means of two sets of oblique grooves c e and e c, which intersect each other so as to leave diamond-shaped projections or teeth between them, as shown in tig. 1.

The grooves are line obliquely in opposite directions, 0 e c e.

The front walls of each groove thus formed are abrupt, and the rear walls sloping, which so modifies the shape of the teeth that the highest front of each one is at the salient angle at the center-of its front wall.

formed by first cutting square across the face of the cylinder, and then cutting a G is the concave, adapted to the shape and size of the cyliuder,-'and mounted upon the cross-beam D, to which it is secured by means of screw-bolts s s passing through a flange, g of the concave.

'lhe bolts are set in slots, either in the flange or the timber, preferably the former, by which arrangement the concave can be adjusted toward or from the cylinder, to grind fine or coarse.

- Another screw-bolt, I, may be employed under the bcam'd), for the purpose of adjusting'the lower end of the concave with relation to the cylinder without changing the position-of the upper end.

The simplest arrangement of such screw is to pass it through a plate, t, attached to the beam, and let its end bear against the rear side of the concave.

By screwing it up it will force the concave toward the cylinder, and when unscrewed again the (3011-. cave, either by its own weight or by the pressure of the material between it and the cylinder, will fall back to its former position.

The two ends of the concave can thus be adjusted with relation to the cylinder independently of each other, and so as to produce almost any desired effect upon the material passed through the 'mill, from merely cracking the kernels to completely pulverizing them, while the side walls of the concave, made semiannular in shape, and embracing the ends'of the cylinder, as shown in fig. 3, render it capable of said adjustment without allowing the grain or other material to escape over the ends of the cylinder.

H is a hopper, supported upon suitable standards, and provided with a flange, h, which closes the open front of the concave above the cylinder, and with an inclined adjustable gate, 2, by which to regulate the feed.

The general construction herein described combines simplicity, economy of material, and strength, while the construction of the cylinder and concave renders the machine more efi'ective, and more easily and perfectly adjustable, according to the work to be performed by it.

, So far as the operation of the concave is concerned it will work equally as well with a vcrticalstone grinding-wheel aswith one composed of metal, al-

thongh the metahie wheel on its part is better for 1 described, of the cylinder MEv and adjustable concave many purpcees than any other. G, hopper H, eut-0if 1 frame A B, and fly-wheels f, Having thus described our invention, when all constructed and operating as shown and de What we claim as new, and desire to secure by scribed, for the purposes set; forth Letters Patent, is- EDWIN D. LITTLE. 1. The cylinder M in the grinding-mill herein de- EDGAR '6. LITTLE. scribed, having the graduated diamond-shaped teeth e a e constructed as shown and described, for the Witnesses: purpose set forth. JOHN DIXON,

'2. The arrangement, in the grinding-mill herein E. A. REYNOLDS. 

